When I needed car service for a work related trip in Phoenix, I had my assistant call the Phoenician (the last hotel I stayed at there) for a recommendation. They suggested Execu Car which by the way is affiliated with the familiar blue SuperShuttle. Anyways, I had a pick-up at the airport, drop off and wait at a site, and then drop-off at the airport. Total was 3 hours, cost $135 before tip. The driver was nice as he should be and prompt. Nothing special here but no red flags..